40 years from now will be 2065. Knowing that the components that many of of these games have made it this far, do you think Ms. Pac, Joust, and Robotron will all be alive and well in 2065? RT has a ways to go to get to 2084. 
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Making it through a single day of a real Robotron world seems almost impossible.I'm not positive the planet will make it another 40 years. Perhaps AI makes Robotron our reality.
My usual speech when this topic comes up, but it can't be said enough:
Some will survive, most won't. That's why it's CRUCIAL to record as much info about them while we can because the ability to reproduce them will be the only way for them to survive long term, and manufacturing technology will make that easier and easier. ROMs, schematics, manuals, scans of artwork, machinist drawings of controls and metal parts, info on custom ICs, CNC files to repro the cabs, even scans of PCB foil patterns, every bit we can while we still can. Quantum is a great example of what I'm talking about, if one wants there is enough info available they can build one entirely from scratch that's more or less identical to an original, and as long as all that info survives so will the game.
Like others have said, without CRTs, all this knowledge and tools of keeping everything else fixed and reproduced won't preserve 80s arcade machines.
I was mind=blown when I read that the real purpose of MAME was to fix real games. I entered a whole other dimension when I started using that to my advantage.I'm not too worried about CRTs. Seem to be plenty. At my existing consumption rate, I have enough in storage for 100 years.
I'd definitely go to MAME before FPGA. At least MAME knows what it is. It doesn't "pretend" t be something it isn't. It's fake, it knows it, it's OK with itself.
I was mind=blown when I read that the real purpose of MAME was to fix real games. I entered a whole other dimension when I started using that to my advantage.
I discovered MAME 25 years ago when my grandparents were retired and out of the business. they made the silly decision to go back at age 75 instead of just selling their land. thus is how I got stuck in this stupid occupation. I won't exist anymore in 40 years, though I do worry about the aftermath in the next 10 years. by then I hope to be away from it all and well, back to MAME.
if I therefore put that type of monitor that enables some sort of scan lines within a little interface board in an old arcade machine then is it really important to also have the original PCB and power supply? Probably not at that point.